Biological Matrix
for Breast Reconstruction

What Is a Biological Matrix for Breast Reconstruction?

Biological matrices belong to a broader family of soft-tissue support materials used in implant-based reconstruction, which also includes acellular dermal matrix (ADM) — typically of human or porcine dermal origin — and synthetic (e.g. titanised polypropylene) meshes. What distinguishes a biological matrix is that it is a naturally derived, cell-free collagen scaffold designed to be remodelled and incorporated by host tissue, combining structural support with biological integration.

Why Bovine Pericardium?

Bovine pericardium — the membranous sac surrounding the bovine heart — has a long, established record as a surgical biomaterial across cardiac, vascular, and reconstructive procedures. Its appeal as a source for a biological matrix comes from its intrinsic material properties: a dense, well-organised type-I collagen architecture that provides high tensile strength while remaining pliable and suturable.

In manufacturing, the tissue is decellularised to remove cellular and antigenic components, leaving an acellular collagen scaffold that reduces immunogenicity while preserving the extracellular-matrix structure that guides host cell in-growth. The result is a matrix that is mechanically robust enough to support an implant pocket yet biologically receptive to revascularisation and integration.

• Strength: Dense collagen provides durable structural reinforcement at the implant pocket.
• Integration: The preserved extracellular-matrix architecture supports cellular in-growth and neovascularisation.
• Low immunogenicity: Decellularisation removes cellular antigens, leaving an acellular scaffold.
• Handling: Pliable and suturable, allowing precise pocket shaping intraoperatively.

The Role of a Biological Matrix in Implant-Based Reconstruction

In prosthetic breast reconstruction, the matrix performs several interrelated functions that collectively improve the stability and quality of the reconstruction:

• Implant coverage and support: The matrix reinforces the soft-tissue envelope, distributing load and supporting the weight of the implant — particularly important in prepectoral placement where the muscle is not used for coverage.
• Pocket definition: It helps define and stabilise the implant pocket, controlling implant position and reducing lateral or inferior migration.
• Lower-pole control: The matrix supports the inframammary fold and lower-pole contour, contributing to a more natural breast shape.
• Tissue-interface quality: By integrating with host tissue, the matrix can improve coverage in thin-flap patients and contribute to reduced rippling and implant palpability — often combined with adjunctive fat grafting for further refinement.

Biological Matrix in Prepectoral Reconstruction

The rise of prepectoral (above-the-muscle) breast reconstruction is closely tied to the availability of dependable soft-tissue support. In the traditional submuscular approach, the pectoralis major is elevated to cover the implant — a technique associated with animation deformity (visible distortion when the muscle contracts) and greater postoperative discomfort. Prepectoral reconstruction places the implant on top of the muscle, wrapped or supported by a biological matrix, sparing the muscle entirely.

In a direct-to-implant (DTI) prepectoral workflow, the matrix provides the coverage and pocket control that the muscle would otherwise supply. This makes the choice and quality of the matrix a central determinant of the reconstruction's stability, and is why bovine-pericardium matrices have been studied specifically in this setting.^[1] For a full explanation of the technique itself, see our pillar guide to prepectoral breast reconstruction.

Biological Matrix vs. ADM vs. Synthetic Mesh

Surgeons choosing a soft-tissue support material weigh biological integration, mechanical strength, evidence base, and cost. The table summarises the practical distinctions; for a detailed, citation-backed evaluation see the companion page Biological Matrix vs. ADM.

The figures above are drawn from different study designs and populations and are indicative rather than like-for-like comparisons; they should not be read as a direct head-to-head outcome claim.

ExaShape — ABC's Biological Matrix

ExaShape is part of ABC's wider reconstructive platform, which also includes the PREPEC®, BioShield Pocket® family, Grid, Expander, and NAC devices, alongside the EXAFAT® fat grafting system for adjunctive refinement. See the full product range.

Clinical Evidence

The evidence base for biological-matrix-supported prepectoral reconstruction has grown substantially. A multicentric prepectoral direct-to-implant series using an acellular bovine-pericardium matrix (De Vita 2024, n=65) reported a 9.2% major-complication rate (6/65).^[1] Real-world registry data from the iBAG multicentre study (Masià 2020) captured 1,450 prepectoral procedures across 30 centres, providing large-scale outcome context for matrix-supported reconstruction.^[3]

For comparative context, a meta-analysis of ADM in implant-based reconstruction (Zhu & Liu 2023, n=2,667) reported complication ranges commonly between 15% and 30%,^[2] and a randomised comparison of ADM versus synthetic mesh (Gschwantler-Kaulich 2016) found an overall major-complication rate around 31%, similar across both arms.^[6] Foundational prepectoral series (Vidya, Masià, Berna et al., 2017) established the technique and its rationale,^[5] and a dedicated safety series on bovine pericardium in prepectoral reconstruction (Casella STEP 2025) adds device-specific data.^[4]

Frequently Asked Questions